Machine job bending wood



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ALONZO CHUBB, OF PAINSVILLE, OHIO.

MACHINE `FOR BENDING WOOD.

Specification of Letters Patent No. 23,012, dated February 22, 1859.

To all whom it may concern:

Be it known that I, ALONZO OI-IUBB, of Painesville, in the county of Lake and State of Ohio, have invented a new and Improved food-Bending Machine, and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is a View in perspective of my improved machine, Fig. 2 a plan view of the top of the same, and Fig. 3 a diagram showing the application of my improvements in bending opposite or contrary curves in the same stuff, the letters of reference marked thereon `indicating similar parts in all the figures.

The main feature of my improvements consists in the employmentof a band (or strap) and a guide, the former being connected and confined to the latter by an apparatus, which will be described, so that the said band keeps the wood to be bent always in a line tangent to every part of the curve, or circle, during the process of bending it, the said band being kept taut while traversing the guide, so that the wood is held tightly to the band by the friction of their contact surfaces. Under this feature I secure the following advantages: 1st. Counteracting tendency to lateral fractures of the outer curve. 2nd. By having the ends of the stud unconined by the usual clamps, headblocks, or seats, provision is made for the emergency of hard, or closegrained, or other refractory portions of the wood, by allowing it to slip or give way when the resistance occasioned by such parts is greater than the friction of the contact surfaces before alluded to. 3rd. Adaption of my said arrangement to the bending of curves in opposite or contrary lines, on the same piece of stuff.

The other feature of my improvements is,

, making the guide adjustable, so that the same guide can be used for two or more sizes of the saine form or pattern mold, as in the case of wagon-fellies, or rims, or other regular form; also, by the said adjustability of the guide, the friction between the contact surfaces can be augmented by increasing the tension of the band.

To enable others to make and usemy said improved machine, I will proceed to describe its construction and operation:

First, a rectangular frame is constructed.

A, A, are the two front posts.. A similar with;4 a corresponding one behind. seen.) girts, (the tenons of which are seen at C, C.) Midway on the top of the said side girts are two standards, (part-ly seen at D, D.) E, F, G, on the upper part of the said frame are the bed timbers, on which is. secured the bending apparatus, the front and end portions of which (E and G) contain slots H, H, and I, I, as shown in the drawing. The middle portion, F, is a frame work, supported by the standards D, D, and short girts J, and K.' Secured to the said frame work is the mold block L, the shape shown in the drawing being intended for forming fellies,

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or rims, for wagon or carriage wheels. This` pairs of iron plates, kept a suitable distance apart by the blocks at the extreme ends, and at P; the ends of the said guides are slotted, as shown. Between the said plates are secured pullies, Q, R. The said guides are secured to the bed timbers by the bolts S and T. U, is a band, or strap, of iron, of sufficient length to pass the ends of the mold.

An apparatus, which will be presently described, is firmly bolted to the end of the strap, or at both ends, as may be required. The said apparatus is made somewhat hooking in form, as seen in the drawing, having in the hooked portion thereof a friction roller V, whose lesser diameter runs or bears against the upper and lower edges of the guide. There are also friction rollers in the cheeks W, WV, as delineated. X, is a hand crank screw, supported and working in a block Y. To the extreme end of the said described apparatus, is secured ropes, or chains, Z, and Z-the chain Z, assing over pulley Q, and over the pulley which is placed between the middle and front bed timbers (E, and F) the other chain, Z, is carried over pulley R, and also over the pulley B, located between the back and middle timbers (G and F). The ends of said chains are fastened to drums O and D', which are secured on a shaft E", whose bearings are in the girt B and its mate. The said shaft carries a toothed wheel, F, as .part of the gearing hereinafter mentioned.

The said posts are united by side I The chains and pulleys together with the shaft, drums, and wheel, are of course duplicated when used for bending half circles, or for two corresponding curves. G is a shaft, which is supported in bearings in the said girts, and carries a pinion wheel (H), which meshes into the wheel F of shaft E. I is a hand crank with a ratchet move ment, and V a clamp.

Before describing the operation of the above mentioned machine it will be necessary to premise that the drawings represent the stuff as bent to the form calculated for wagon or carriage wheel fellies-and the manner of arranging the strap and guides therefor; also the mode of using the center stay-lath hereinafter mentioned.

The operation is conducted as follows: A piece of wood, of the requisite length, and first steamed, is placed on the bed of the machine, its middle in contact with the mold, the band or strapy being previously drawn back to receive it. The band is then forced forward by the hand screw, which confines the wood to the mold securely. Power is then applied to the driving shaft (G), by the hand crank or otherwise, which gives motion to drums C and C', winding the chains Z and Z on them, and, as is obvious, drawing the ends of the band in the track of the guides M, the said guides always keeping the band tangentially with the curve of the mold to the close of theA The center stay-lath, before referred to, is

then introduced by slipping it into the notches a a. The band is now released and drawn back by a reverse movement of the power, the chains Z winding up on the drums D', as shown. The hand screw is also reversed, and the -bent article removed. The machine is then ready for repeating the operation. The mold is removable so that l different sizes of the saine pattern, or any other pattern, can readily be attached to the bed. The friction of the said contact surfaces prevents all liability to lateral fractures of the fibers of the wood, as every portion of its length is tightly held until bent, and when so bent is, of course, securely confined by the bent part of the band. The said friction of contact surfaces also does away with clamps, and other similar devices for holding the ends of the wood during the operation of bending, and allows the stuff when it happens to have any refractory, or hard grained part in it, to slip, or give way, should its resistance be greater than the said friction.

The diagram in Fig. 3 shows the arrangement of the band and guides on the frame when the machine is required to bend opposite or contrary curves on the same piece of stuff-the draft being employed at two different points as indicated by the arrows. The guide, or guides, are adjustable, as eX- plained, which serves the two-fold purpose of making the same guide, or guides, answer for a plurality of sizes of the same pattern, and for giving greater tension to the band, and thereby increasing the amount of friction between the contact surfaces.

A Having described the nature, construction, and operation, of my improvements what I claim therein as new and desire to secure by Letters Patent is the following:

l. I claim the combination and arrangement of the strap U, with the guides M, in the manner and for the purposes set forth.

2. I-claim making the guides adjustable by the use of the slots therein, and of corresponding ones in the bed timbers, as shown, and for the purposes set forth.

ALONZO CHUBB.

Vitnesses:

J. F. SINGLE,

WM. PETTINGELL. 

